NYC-WTC_000188034

NYC 9/11 Public Portal Document fwz2as3s=a2Si*j

s L 3 A ■ Certified Testing Laboratories, Inc. DATE: May 9, 2002 Civetta-Cousins JV LAB NO; 12737

Co.’npressive Strenghts

1 2 3 4 7 Days (psi^ •. 4100. 4490 ■ 4990 53S0 39S0 4550 4930 5430

average 4040 4520 i960 . 5410

28 Days (psi) 5270 5730 - 6420 6720 5150 5640 63SO 6670 5180. 5660 6260 '6750 5270 ■ . 5780 6330 6830

average 5220 5700 6350 6740

Laboratory sized batches were made. Six cylinders were cast for each'batch and the preceding test results were obtained from .these cylinders, The test cylinders had. been stored in a.moisture room at the temperature of -.72 degrees .F and 95% humidity from' the date of casting until the date of testing. The cement and water are for a slump of four inches, with aggregates noted ( +. one .inch in field). Based on our laboratory results, we suggest using MIX #4 for 5000 psi concrete.

NOTE: Add WE Grace Daraset when necessary at rate depending on ambient temperature below 50’F, from Respectfully submitted, CERTmED TESTING L.4B0RAT0r:|: 007,^' .h . , . 10 oz/lOO CW to 40 oz/100 As follows: 40to50“-10o2/100cw 3Uto4U°~20r)2/lU0cw 20to30’-3bo‘z/lD0cw KYC CERVPiC.A7E 0? QU.ALIFICATION #3 lUto20°-40oz/100cw

H256

CITY_21MC100_004921879

NYC-WTC_000188037